Why is that? I'm getting a new mbp 13" (non-retina) soon and I intend to put Arch Linux on it. Other than bootloader issues (and maybe wireless issues?) I don't think there'll be other issues with it.
I could never get the trackpad quite right, and the battery never lasted as long as it did with OS X. My travel kit is dual laptops. One Linux and one Mac. So far the T430s with 16gb RAM is looking very close to ideal.